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| author | Alexander Graf <agraf@suse.de> | 2009-04-14 16:24:15 +0200 |
|---|---|---|
| committer | Junfeng Dong <junfeng.dong@intel.com> | 2013-11-19 18:17:00 +0800 |
| commit | f80250e110a9692f9d538ec8663302184b9eae88 (patch) | |
| tree | 0f22059140f56385bf5f2b67b6ddadc1fb3c6222 | |
| parent | 81b6f374e583ea3a0048d948d2eabee277247b0d (diff) | |
| download | qemu-f80250e110a9692f9d538ec8663302184b9eae88.tar.gz qemu-f80250e110a9692f9d538ec8663302184b9eae88.tar.bz2 qemu-f80250e110a9692f9d538ec8663302184b9eae88.zip | |
qemu-cvs-alsa_mmap
Hack to prevent ALSA from using mmap() interface to simplify emulation.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Ulrich Hecht <uli@suse.de>
| -rw-r--r-- | linux-user/mmap.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/linux-user/mmap.c b/linux-user/mmap.c index a249f0ceb..34a561512 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -366,6 +366,9 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size) } } +#define SNDRV_PCM_MMAP_OFFSET_STATUS 0x80000000 +#define SNDRV_PCM_MMAP_OFFSET_CONTROL 0x81000000 + /* NOTE: all the constants are the HOST ones */ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, int flags, int fd, abi_ulong offset) @@ -400,6 +403,17 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, } #endif + /* Alsa tries to communcate with the kernel via mmap. This usually + * is a good idea when user- and kernelspace are running on the + * same architecture but does not work out when not. To make alsa + * not to use mmap, we can just have it fail on the mmap calls that + * would initiate this. + */ + if(offset == SNDRV_PCM_MMAP_OFFSET_STATUS || offset == SNDRV_PCM_MMAP_OFFSET_CONTROL) { + errno = EINVAL; + return -1; + } + if (offset & ~TARGET_PAGE_MASK) { errno = EINVAL; goto fail; |